Life Extension (4 pack) Life Extension NAC N-Acetyl-L-Cysteine, Immune Support, Respiratory Health, Liver Function, 600 mg, 60 Capsules Review
Life Extension N-Acetyl-L-Cysteine (NAC) is a non-GMO, gluten-free dietary supplement providing 600 mg of N-acetyl-L-cysteine per capsule in a 60-capsule bottle (Item # 01534). N-Acetyl-L-Cysteine (NAC) is an easily absorbed nutrient with robust, powerful benefits for whole body health, including immune support, bronchial health, respiratory support, and liver health. In the body, N-acetyl-L-cysteine serves as a precursor to glutathione, helping to replenish the body's natural supply of this critical compound. Both N-acetyl-L-cysteine and glutathione have powerful antioxidant effects that work at the cellular level to fight back against oxidizing free radicals and protect cells from free radical damage and oxidative stress. Studied extensively for its immune health benefits, N-acetyl-L-cysteine offers powerful support for immune system function and defends against insults from foreign compounds. Furthermore, NAC supports healthy respiratory function and bronchial health while encouraging healthy liver function and detoxification. Rather than simply delivering exogenous antioxidants, NAC supports the body's own natural antioxidant production. Numerous placebo-controlled studies suggest that N-acetyl-L-cysteine supplementation can favorably affect overall well-being and quality of life. Each vegetarian capsule contains 600 mg of rapidly absorbed N-acetyl-L-cysteine along with other ingredients including vegetable cellulose (capsule), vegetable stearate, and silica. For optimal dosage and use, individuals are directed to take one (1) capsule one to three times daily, or as recommended by a healthcare practitioner, providing a 20 to 60 day supply per bottle. Product warnings advise users to keep the bottle out of reach of children, not to exceed the recommended dose, and not to purchase if the outer seal is broken or damaged. When using nutritional supplements, consumers should consult with their physician if they are undergoing treatment for a medical condition or if they are pregnant or lactating. These statements have not been evaluated by the Food and Drug Administration, and these products are not intended to diagnose, treat, cure, or prevent any disease.
Study, Trial or Testing Result Summary
MembersHuman studies
15 of these 58 human studies gave n-acetylcysteine by drip or inhaler, not by mouth.
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Review Totals and Summary
Members22,439 reviews
Biohacker Summary
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RAL Summary
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More Details
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Supplement Facts
N-acetyl-L-cysteine 600 mg
| N-acetyl-L-cysteine | 600 mg | † |
Other ingredients: Vegetable cellulose (capsule), vegetable stearate, silica.
Directions: Take one (1) capsule one to three times daily, or as recommended by a healthcare practitioner.
Label source: Lifeextension · Report a label change
Where to Buy
Life Extension · iHerb · Rejuvenation-science
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Graded October 28, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.

